Add support for namespaces.

For details of the new feature, see
https://github.com/luarocks/luarocks/wiki/Namespaces

This ended up being a huge commit because of some major refactoring
motivated by the new feature:

* new modules for some object types:
  * `luarocks.queries` - all functions that look for rocks in local or
    remote repositories now use objects constructed by this module:
    query objects contain the name, namespace and query constraints.
    Dependencies in a rockspec are also stored as query objects.
  * `luarocks.results` - all individual results produces from queries
    are returned in this format: result objects contain the name,
    namespace, version, arch and repo.
* the `results` object was renamed to `result_tree`, to better
  reflect that it is not an array of `result` objects.
* `luarocks.vers` was removed, its functionality was moved to better locations.

Specifically on namespaces:

* Commands that take a rock `name` can now take `namespace/name`
  (and alternately `--flags=namespace` so that URLs can be
  also installed with a nominal namespace).
* Rocks installed from a namespace now create a `rock_namespace`
  file alongside `rock_manifest`, which is used when matching
  namespaced dependencies against locally-installed rocks.
* Using namespaced dependencies in a rockspec, requires
  `rockspec_format = "3.0"`.
* Tests under the `#namespaces` hashtag, all using a local repository.

1 files changed, 2 insertions, 2 deletions

diff --git a/Makefile.setup.inc b/Makefile.setup.inc
index d762f6f7..ed3face4 100644
--- a/Makefile.setup.inc
+++ b/Makefile.setup.inc
@@ -21,5 +21,5 @@ admin/cmd/make_manifest.lua admin/cmd/add.lua admin/cmd/remove.lua \
 admin/cmd/refresh_cache.lua remove.lua fetch/git_file.lua fetch/sscm.lua \
 fetch/cvs.lua fetch/git_https.lua fetch/git_ssh.lua fetch/hg_http.lua \
 fetch/git_http.lua fetch/svn.lua fetch/git.lua fetch/hg_ssh.lua \
-fetch/hg_https.lua fetch/hg.lua vers.lua core/vers.lua cmd/which.lua \
-fun.lua type/manifest.lua type/rockspec.lua
+fetch/hg_https.lua fetch/hg.lua core/vers.lua cmd/which.lua \
+fun.lua type/manifest.lua type/rockspec.lua queries.lua results.lua